﻿using Rss_1._1._0.Common;
using System;
using System.Collections.Generic;
using System.IO;
using System.Linq;
using System.Runtime.InteropServices.WindowsRuntime;
using Windows.Foundation;
using Windows.Foundation.Collections;
using Windows.UI.Xaml;
using Windows.UI.Xaml.Controls;
using Windows.UI.Xaml.Controls.Primitives;
using Windows.UI.Xaml.Data;
using Windows.UI.Xaml.Input;
using Windows.UI.Xaml.Media;
using Windows.UI.Xaml.Navigation;
using System.Xml.Serialization;
using System.Net;
using Rss_1._1._0.Model;
using Rss_1._1._0.ViewModel;

// The Basic Page item template is documented at http://go.microsoft.com/fwlink/?LinkId=234237

namespace Rss_1._1._0
{
    /// <summary>
    /// A basic page that provides characteristics common to most applications.
    /// </summary>
    public sealed partial class ContentPage : Page
    {
        private MainViewModel MainView;
        private NavigationHelper navigationHelper;
        private ObservableDictionary defaultViewModel = new ObservableDictionary();

        /// <summary>
        /// This can be changed to a strongly typed view model.
        /// </summary>
        public ObservableDictionary DefaultViewModel
        {
            get { return this.defaultViewModel; }
        }

        /// <summary>
        /// NavigationHelper is used on each page to aid in navigation and 
        /// process lifetime management
        /// </summary>
        public NavigationHelper NavigationHelper
        {
            get { return this.navigationHelper; }
        }

        private void ReadRss(IAsyncResult result)
        {
            HttpWebRequest request = result.AsyncState as HttpWebRequest;
            HttpWebResponse reponse = request.EndGetResponse(result) as HttpWebResponse;
            using (Stream stream = reponse.GetResponseStream())
            {

                XmlSerializer sertialiser = new XmlSerializer(typeof(Rss));
                Rss rss = (Rss)sertialiser.Deserialize(stream);
                Dispatcher.RunAsync(Windows.UI.Core.CoreDispatcherPriority.Normal, () =>
                {
                    this.MainView.CurrentRss = rss;
                });

            }
        }

        private void read(string url)
        {

            if (url != "")
            {
                HttpWebRequest request = HttpWebRequest.CreateHttp(url);
                request.BeginGetResponse(new AsyncCallback(ReadRss), request);
            }
        }



        private void Click(string x)
        {


            switch (x)
            {
                case "TinHot":
                    read("http://vietnamnet.vn/rss/moi-nong.rss");
                    break;
                case "XaHoi":
                    read("http://vietnamnet.vn/rss/xa-hoi.rss");
                    break;
                case "GiaoDuc":
                    read("http://vietnamnet.vn/rss/giao-duc.rss");
                    break;
                case "ChinhTri":
                    read("http://vietnamnet.vn/rss/chinh-tri.rss");
                    break;

                case "KinhTe":
                    read("http://vietnamnet.vn/rss/kinh-te.rss");
                    break;
                case "VanHoa":
                    read("http://vietnamnet.vn/rss/van-hoa.rss");
                    break;
                case "KhoaHoc":
                    read("http://vietnamnet.vn/rss/khoa-hoc.rss");
                    break;
                case "CNTT":
                    read("http://vietnamnet.vn/rss/cong-nghe-thong-tin-vien-thong.rss");
                    break;


            }
        }

        public ContentPage()
        {
            this.InitializeComponent();
            this.navigationHelper = new NavigationHelper(this);
            this.navigationHelper.LoadState += navigationHelper_LoadState;
            this.navigationHelper.SaveState += navigationHelper_SaveState;
            this.MainView = new MainViewModel();
            this.DataContext = this.MainView;
        }

        /// <summary>
        /// Populates the page with content passed during navigation. Any saved state is also
        /// provided when recreating a page from a prior session.
        /// </summary>
        /// <param name="sender">
        /// The source of the event; typically <see cref="NavigationHelper"/>
        /// </param>
        /// <param name="e">Event data that provides both the navigation parameter passed to
        /// <see cref="Frame.Navigate(Type, Object)"/> when this page was initially requested and
        /// a dictionary of state preserved by this page during an earlier
        /// session. The state will be null the first time a page is visited.</param>
        private void navigationHelper_LoadState(object sender, LoadStateEventArgs e)
        {
            string b = e.NavigationParameter as string;
            
            Click(b);
            pageTitle.Text = b;
        }

        /// <summary>
        /// Preserves state associated with this page in case the application is suspended or the
        /// page is discarded from the navigation cache.  Values must conform to the serialization
        /// requirements of <see cref="SuspensionManager.SessionState"/>.
        /// </summary>
        /// <param name="sender">The source of the event; typically <see cref="NavigationHelper"/></param>
        /// <param name="e">Event data that provides an empty dictionary to be populated with
        /// serializable state.</param>
        private void navigationHelper_SaveState(object sender, SaveStateEventArgs e)
        {
        }

        #region NavigationHelper registration

        /// The methods provided in this section are simply used to allow
        /// NavigationHelper to respond to the page's navigation methods.
        /// 
        /// Page specific logic should be placed in event handlers for the  
        /// <see cref="GridCS.Common.NavigationHelper.LoadState"/>
        /// and <see cref="GridCS.Common.NavigationHelper.SaveState"/>.
        /// The navigation parameter is available in the LoadState method 
        /// in addition to page state preserved during an earlier session.

        protected override void OnNavigatedTo(NavigationEventArgs e)
        {
            navigationHelper.OnNavigatedTo(e);
        }

        protected override void OnNavigatedFrom(NavigationEventArgs e)
        {
            navigationHelper.OnNavigatedFrom(e);
        }

        #endregion

        private void click(object sender, SelectionChangedEventArgs e)
        {
            if (GridView.SelectedItem != null)
            {
                NewsItem selectedNews = GridView.SelectedItem as NewsItem;
                 
                Frame.Navigate(typeof(Read), selectedNews);

            }
        }
    }
}
